TWI642967B - Annular optical component, image capturing module and electronic device - Google Patents

Abstract

An annular optical element includes an inner annular surface, an outer diameter surface, an object side surface, and an image side surface. The inner annular surface surrounds the central axis of the annular optical element to form a central opening. The outer diameter surface is disposed opposite the inner annular surface. The object side faces the object side and connects the outer diameter surface and the inner ring surface. The image side faces the direction of the image side and connects the outer diameter surface and the inner annular surface, and the image side is opposite to the object side. The inner annular surface is provided with a plurality of annular L-shaped grooves. The annular L-shaped groove is provided with a plurality of strip-shaped structures, and these strip-shaped structures are annularly arranged along the circumferential direction of the annular optical element. The annular L-shaped groove includes a first side and a second side that are interposed between the object side and the image side. The strip structure is disposed on the first side or the second side, and the inclination degree between the first side and the central axis is greater than the inclination degree between the second side and the central axis.

Description

Ring optical element, imaging lens module and electronic device

The invention relates to a ring-shaped optical element, an imaging lens module and an electronic device, in particular to a ring-shaped optical element and an imaging lens module suitable for an electronic device.

With the advancement of semiconductor process technology, the performance of electronic photosensitive elements has been improved, and pixels can reach even smaller sizes. Therefore, optical lenses with high imaging quality have become an indispensable part. In addition, with the rapid development of science and technology, the application range of electronic devices equipped with optical lenses has become more extensive, and the requirements for optical lenses have also become more diverse.

However, the existing optical lens is obviously incomplete in eliminating stray light. When there is strong light near the environment where the subject is located, the unnecessary light generated by the strong light entering the optical lens will still be received by the electronic photosensitive element, resulting in halo around the image of the subject. Specifically, the above-mentioned shooting environment that leads to imaging quality often occurs when the subject is located outdoors in sunny weather with a lot of sunlight, or the subject is located in a dim room with high-intensity light sources around.

In view of the above-mentioned problems, the present invention discloses a ring-shaped optical element, an imaging lens module, and an electronic device. The ring-shaped optical element helps to solve the unnecessary light caused by the strong light near the environment where the subject is located. Problems with poor imaging quality.

The invention provides a ring-shaped optical element, which includes an inner ring surface, an outer diameter surface, an object side surface, and an image side surface. The inner annular surface surrounds a central axis of the annular optical element to form a central opening. The outer diameter surface is disposed opposite the inner annular surface. The object side faces the object side direction of the ring-shaped optical element and connects the outer diameter surface and the inner ring surface. The image side faces the direction of the image side of the ring-shaped optical element, connects the outer diameter surface and the inner ring surface, and is disposed opposite the image side and the object side. The inner annular surface is provided with a plurality of annular L-shaped grooves. These annular L-shaped grooves are respectively provided with a plurality of strip-shaped structures, and the strip-shaped structures are arranged annularly along the circumferential direction of the annular optical element. The annular L-shaped groove includes an object-side annular L-shaped groove closest to the object side and an image-side annular L-shaped groove closest to the image side, and the bottom diameter of the image-side annular L-shaped groove is larger than the object-side annular shape. The bottom diameter of the L-shaped groove. The annular L-shaped groove includes a first side and a second side connected between the object side and the image side and connected to each other. The strip structure is disposed on one of the first side and the second side, and the inclination between the first side and the central axis of the annular optical element is greater than the inclination between the second side and the central axis of the annular optical element.

The invention further provides a ring-shaped optical element, which includes an inner ring surface, an outer diameter surface, an object side surface, and an image side surface. The inner annular surface surrounds a central axis of the annular optical element to form a central opening. The outer diameter surface is disposed opposite the inner annular surface. The object side faces the object side direction of the ring-shaped optical element and connects the outer diameter surface and the inner ring surface. The image side faces the direction of the image side of the ring-shaped optical element, connects the outer diameter surface and the inner ring surface, and is disposed opposite the image side and the object side. The inner annular surface is provided with at least one annular L-shaped groove, and the annular L-shaped groove is provided with a plurality of wedge-shaped strip structures. These wedge-shaped strip structures are arranged annularly along the circumferential direction of the ring-shaped optical element, and each of these wedge-shaped strip structures includes a tapered portion. The annular L-shaped groove includes a first side and a second side connected between the object side and the image side and connected to each other. The inclination between the first side and the central axis of the ring-shaped optical element is greater than the inclination of the second side and the central axis of the ring-shaped optical element, and these wedge-shaped strip structures are disposed on the second side. The inclination between the second side and the central axis of the annular optical element is α, which satisfies the following conditions:

0 degrees ≦ α ≦ 15 degrees.

The present invention provides an imaging lens module including any of the aforementioned annular optical elements and an optical lens group, and the annular optical element is disposed in the optical lens group.

The present invention provides an electronic device including the aforementioned imaging lens module.

According to the ring-shaped optical element, the imaging lens module and the electronic device disclosed in the present invention, a ring-shaped groove is designed to provide a plurality of strip-shaped structures arranged in a space along the circumferential direction. The strip structure can enhance the structural strength of the ring optical element, and any two adjacent strip structures provide a fine light trap structure. In this way, the light trap structure formed by the strip structure helps to capture and receive unnecessary light entering the optical lens, and prevents excessive stray light from affecting the imaging quality. In addition, it is also convenient to change the size and shape of the strip structure in the manufacturing process, so that the design of the ring optical element is more flexible, and thus it is suitable for a variety of optical specifications lenses.

The above description of the contents of this disclosure and the description of the following embodiments are used to demonstrate and explain the spirit and principle of the present invention, and provide a further explanation of the scope of the patent application of the present invention.

The detailed features and advantages of the present invention are described in detail in the following embodiments. The content is sufficient for any person skilled in the art to understand and implement the technical content of the present invention, and according to the content disclosed in this specification, the scope of patent applications and the drawings. Anyone skilled in the relevant art can easily understand the related objects and advantages of the present invention. The following examples further illustrate the viewpoints of the present invention, but do not limit the scope of the present invention in any way.

The annular optical element includes an inner torus, an outer diameter, an object side, and an image side. The inner annular surface surrounds the central axis of the annular optical element to form a central opening. The outer diameter surface is disposed opposite the inner annular surface. The object side faces the object side direction of the ring-shaped optical element and connects the outer diameter surface and the inner ring surface. The image side faces the direction of the image side of the ring-shaped optical element, connects the outer diameter surface and the inner ring surface, and is disposed opposite the image side and the object side. The inner annular surface is provided with at least one annular L-shaped groove. The annular L-shaped groove is provided with a plurality of strip-shaped structures, and these strip-shaped structures are annularly arranged along the circumferential direction of the annular optical element. The annular L-shaped groove includes a first side and a second side that are interposed between the object side and the image side. The strip structure is disposed on one of the first side and the second side, and the inclination between the first side and the central axis of the annular optical element is greater than the inclination between the second side and the central axis of the annular optical element. The design of a circular L-shaped groove is used to provide a space to arrange a plurality of strip structures arranged along the circumferential direction. The strip structure can enhance the structural strength of the ring optical element, and any two adjacent strip structures provide a fine light trap structure. In this way, the light trap structure formed by the strip structure helps to capture and receive unnecessary light entering the optical lens, and prevents excessive stray light from affecting the imaging quality. In addition, it is also convenient to change the size and shape of the strip structure in the manufacturing process, so that the design of the ring optical element is more flexible, and thus it is suitable for a variety of optical specifications lenses.

The number of the circular L-shaped grooves may be plural, and each of the circular L-shaped grooves is provided with a plurality of strip structures. When a plurality of annular L-shaped grooves are provided on the inner annular surface, these annular L-shaped grooves include an object-side annular L-shaped groove closest to the object side and an image-side annular L-shaped groove closest to the image side. The diameter of the bottom of the annular L-shaped groove on the image side is larger than the diameter of the bottom of the annular L-shaped groove on the object side. This helps to improve the efficiency of the strip structure to capture and receive unnecessary light.

The ring-shaped optical element disclosed in the present invention may include a ring-shaped body and the aforementioned plurality of strip structures. The ring body includes an inner ring surface, an outer diameter surface, an object side surface and an image side surface, and these strip structures are integrally formed with the ring body. In this way, the ring-shaped optical element can be produced using injection molding technology, and a low-cost manufacturing method is satisfied.

The angle between the first side and the second side of each annular L-shaped groove is θ, which can satisfy the following conditions: 46 degrees <θ <136 degrees. Thereby, there can be more adjustment margin when designing the mold for manufacturing the annular optical element, and the configuration of the L-shaped groove required for capturing unnecessary light will not be lost. Preferably, it can further satisfy the following conditions: 64 degrees <θ <116 degrees.

When a plurality of annular L-shaped grooves are provided on the inner circumferential surface, these annular L-shaped grooves may not overlap each other in a direction parallel to the central axis of the annular optical element. Therefore, when the ring-shaped optical element is manufactured by injection molding, the results of the release stage are easier to grasp, which avoids the situation that the draft is not easy or the draft is pulled.

The thickness of the ring-shaped optical element is t, and the length of each strip structure is d, which can satisfy the following conditions: 0.05 <d / t <0.50. Thereby, when manufacturing the ring-shaped optical element, it is possible to avoid the undesired conditions such as distortion of the excessively long strip structure.

The number of annular L-shaped grooves may be two, that is, an object-side annular L-shaped groove near the object side and an image-side annular L-shaped groove near the image side are provided on the inner annular surface. The length of the strip structure provided on the object-side annular L-shaped groove is d1, and the length of the strip structure provided on the image-side annular L-shaped groove is d2, which can satisfy the following conditions: 0.40 <d1 / d2 <2.5. Therefore, limiting the number of annular L-shaped grooves to only two can avoid excessive strip structures, which can help to reduce the number of strip structures properly, avoid excessive manufacturing time, and improve production efficiency.

The width of the first side of the circular L-shaped groove is L1, and the width of the second side of the circular L-shaped groove is L2, which can satisfy the following conditions: 0.45 <L1 / L2 <2.5. Therefore, the configuration of the L-shaped groove is better for capturing unnecessary light, and can avoid the situation that the unnecessary light will still leave the L-shaped groove after being reflected by the strip structure.

The inclination between the second side of the annular L-shaped groove and the central axis of the annular optical element is α, which can satisfy the following conditions: 0 degrees ≦ α ≦ 15 degrees. Thereby, when manufacturing the ring-shaped optical element, the success rate of mold release can be improved, while maintaining the working range where the L-shaped groove receives unnecessary light. 0 degrees ≦ α ≦ 8.0 degrees.

In the ring-shaped optical element disclosed in the present invention, the strip structure may be a wedge-shaped strip structure. This helps to simplify the complexity of mold processing and improve the yield of injection molding.

In the ring-shaped optical element disclosed in the present invention, the wedge-shaped strip structure may include a tapered portion. Thereby, a finer sub-light trap structure can be formed.

In the annular optical element disclosed in the present invention, the tapered portion of the wedge-shaped strip structure may have a smooth surface. This helps to ensure the efficacy of the secondary light trap structure, and at the same time eliminates the surface roughening process, thereby reducing the number of mold processing steps.

These strip structures have a uniform height, and the height of the strip structure is h, which can satisfy the following conditions: 0.015 mm <h <0.23 mm. Thereby, the secondary light trap structure with an ideal depth is formed at an appropriate height, which makes it more ideal to reduce the efficiency of unnecessary light. Preferably, it can further satisfy the following conditions: 0.02 mm <h <0.12 mm.

In the ring-shaped optical element disclosed in the present invention, the inner ring surface of the ring-shaped optical element may appear zigzag when the ring-shaped optical element is viewed from the side. In this way, a light-trap structure of higher complexity in at least two dimensions can be established, which can further resist more stringent night-scape shooting or darkroom shooting conditions, and maintain better imaging quality.

In the case where two or more annular L-shaped grooves are provided on the inner ring surface, the bottom diameter of the object-side annular L-shaped groove near the object side is φ1, and the diameter of the bottom of the image-side annular L-shaped groove near the image side is It is φ2, the diameter of the outer surface of the ring-shaped optical element is φo, and the diameter of the inner surface of the ring-shaped optical element is φi, which can satisfy the following conditions: 0.05 <(φ2-φ1) / (φo-φi) <0.55. When a single annular L-shaped groove is provided on the inner annular surface, the diameter of the bottom of the annular L-shaped groove is φg, the diameter of the outer diameter surface of the annular optical element is φo, and the diameter of the inner annular surface of the annular optical element is φi, which can satisfy the following conditions: 0.5 <(φo-φg) / (φg-φi) <10. Thereby, the position of the L-shaped groove can be appropriately arranged, and the process of injection molding of the ring-shaped component can reduce the appearance defects of the component warpage and the shrinkage of the dents, thereby improving the manufacturing quality.

The invention further provides an imaging lens module, which includes the aforementioned annular optical element and an optical lens group, wherein the annular optical element is disposed in the optical lens group. Preferably, the imaging lens module may further include a barrel member, a holding member, or a combination thereof.

The annular optical element disclosed in the present invention may include an axially assembled structure, and the annular optical element is disposed in the optical lens group through the axially assembled structure. The axial assembly structure is used to align the annular optical element and the lens adjacent to the annular optical element in the optical lens group with each other at the center. This helps to increase the overall coaxiality of the optical lens group, and largely compensates for the unavoidable tolerance defects in the assembly process.

The annular optical element disclosed in the present invention may be a fixing ring, which is used for fixing the distance between the plurality of lenses of the optical lens group. The central opening of the annular optical element is used to pass imaging light through the imaging lens module, and only one of the object side and the image side of the annular optical element is in contact with the optical lens group. Thereby, it is helpful to prevent variation in the interval between adjacent lenses in the optical lens group due to the influence of the external environment, thereby improving the reliability of the optical quality.

In the annular optical element disclosed in the present invention, the annular L-shaped groove is basically an L-shaped first side and a second side composed of two annular surfaces. The shape of the connection between the first side and the second side may not be limited to an acute angle, an obtuse angle, a Corner with radius, or other geometric shapes.

In the ring-shaped optical element disclosed in the present invention, the shape of the tapered portion of the wedge-shaped strip structure can be reduced simultaneously from both sides of an approximately isosceles triangle.

In the ring-shaped optical element disclosed in the present invention, the opening direction of the ring-shaped L-shaped groove faces one of the image side surface and the center opening, or may be a direction in between.

Each of the technical features in the above-mentioned annular optical element of the present invention can be configured in combination to achieve corresponding effects.

According to the foregoing implementation manners, specific examples are provided below and described in detail with reference to the drawings.

<First Embodiment>

Please refer to FIGS. 1 to 3, wherein FIG. 1 is a schematic perspective view of a ring optical element according to a first embodiment of the present invention, FIG. 2 is a schematic top view diagram of the ring optical element of FIG. 1, and FIG. A schematic cross-sectional side view of a ring optic. In this embodiment, the ring-shaped optical element includes a ring-shaped body 11 and a plurality of strip-shaped structures 12 integrally formed.

The ring body 11 includes an inner ring surface 111, an outer diameter surface 112, an object side surface 113, and an image side surface 114. The inner annular surface 111 surrounds the central axis A of the annular optical element to form a central opening 115. The outer diameter surface 112 is disposed opposite the inner annular surface 111. The object-side surface 113 faces the object-side direction of the ring-shaped optical element and connects the outer diameter surface 112 and the inner ring surface 111. The image side surface 114 faces the image side direction of the ring-shaped optical element and connects the outer diameter surface 112 and the inner ring surface 111, and the image side surface 114 is disposed opposite to the object side surface 113. As shown in FIG. 3, the inner annular surface 111 of the annular optical element is jagged when viewed from the side of the annular optical element.

Please refer to FIG. 4 to FIG. 6 together, wherein FIG. 4 and FIG. 5 are partial enlarged views of the annular optical element of FIG. 3. FIG. 6 is a partially enlarged view of the annular optical element of FIG. 1. The inner annular surface 111 is provided with two annular L-shaped grooves 1111. Among them, the annular L-shaped groove 1111 closer to the object side 113 is an object-side annular L-shaped groove, and the annular L-shaped groove 1111 closer to the image side 114 is Image side annular L-shaped groove. The two annular L-shaped grooves 1111 do not overlap each other in a direction parallel to the central axis A of the annular optical element. The annular L-shaped groove 1111 is provided with a stripe structure 12, and a plurality of stripe structures 12 on each of the annular L-shaped grooves 1111 are arranged annularly along the circumferential direction of the annular optical element. In detail, each of the annular L-shaped grooves 1111 includes a first side 1111a and a second side 1111b connected between the object side surface 113 and the image side surface 114 and connected to each other, and the strip structure 12 is disposed on the second side 1111b. As shown in FIG. 6, one end of each strip structure 12 directly contacts the first side 1111 a of the annular L-shaped groove 1111, and the other end faces the image-side direction of the annular optical element.

Each of the strip structures 12 is a wedge-shaped strip structure including a tapered portion 121, and the tapered portion 121 of the wedge-shaped strip structure has a smooth surface. In detail, the size of the tapered portion 121 gradually decreases from the bottom portion 1211 near the second side 1111b toward the top portion 1212 away from the second side 1111b. The two side slopes 1213 of the tapered portion 121 are smooth surfaces.

The bottom diameter φ2 of the image-side annular L-shaped groove (annular L-shaped groove 1111 near the image side 114) is larger than the bottom diameter φ1 of the object-side annular L-shaped groove (annular L-shaped groove 1111 near the object side 113). The inclination β between the first side 1111a and the central axis A of the annular optical element is greater than the inclination α between the second side 1111b and the central axis A of the annular optical element. FIG. 4 illustrates that an angle between a reference line parallel to the second side 1111b and another reference line parallel to the central axis A is α.

The angle between the first side 1111a and the second side 1111b of each annular L-shaped groove 1111 is θ, which satisfies the following conditions: θ = 93 degrees.

The thickness of the ring-shaped optical element is t, and the length of the strip structure 12 disposed on the object-side ring-shaped L-shaped groove is d1, which satisfies the following condition: d1 / t = 0.30.

The thickness of the ring-shaped optical element is t, and the length of the strip structure 12 disposed on the image-side ring-shaped L-shaped groove is d2, which satisfies the following condition: d2 / t = 0.35.

The length of the strip structure 12 provided on the object-side annular L-shaped groove is d1, and the length of the strip structure 12 provided on the image-side annular L-shaped groove is d2, which satisfies the following conditions: d1 / d2 = 0.85.

The width of the first side 1111a of the object-side annular L-shaped groove is L1, and the width of the second side 1111b of the object-side annular L-shaped groove is L2, which satisfies the following conditions: L1 / L2 = 1.36.

The width of the first side 1111a of the image-side annular L-shaped groove is L1, and the width of the second side 1111b of the image-side annular L-shaped groove is L2, which satisfies the following conditions: L1 / L2 = 1.0.

The inclination between the second side 1111b of the annular L-shaped groove 1111 and the central axis A of the annular optical element is α, which satisfies the following conditions: α = 2.955 degrees.

These strip structures 12 have a uniform height. The height of the strip structure 12 is h, which satisfies the following conditions: h = 0.04 mm.

The diameter of the bottom of the object-side annular L-shaped groove is φ1, the diameter of the bottom of the image-side annular L-shaped groove is φ2, the diameter of the outer diameter surface 112 of the annular optical element is φo, and the diameter of the inner annular surface 111 of the annular optical element is φi, which satisfies the following conditions: (φ2-φ1) / (φo-φi) = 0.30.

<Second Embodiment>

Please refer to FIG. 7 to FIG. 9 at the same time, wherein FIG. 7 is a schematic side sectional view of the annular optical element according to the second embodiment of the present invention, and FIG. 8 and FIG. 9 are partial enlarged views of the annular optical element of FIG. In this embodiment, the ring-shaped optical element includes a ring-shaped body 21 and a plurality of strip-shaped structures 22 that are integrally formed.

The ring body 21 includes an inner ring surface 211, an outer diameter surface 212, an object side surface 213, and an image side surface 214. The inner annular surface 211 surrounds the central axis A of the annular optical element to form a central opening 215. The outer diameter surface 212 is opposed to the inner annular surface 211. The object side surface 213 faces the object side direction of the ring-shaped optical element and connects the outer diameter surface 212 and the inner ring surface 211. The image side surface 214 faces the image side direction of the annular optical element and connects the outer diameter surface 212 and the inner ring surface 211, and the image side surface 214 is disposed opposite to the object side surface 213. As shown in FIG. 7, the inner annular surface 211 of the annular optical element is jagged when viewed from the side of the annular optical element.

The inner annular surface 211 is provided with two annular L-shaped grooves 2111, of which the annular L-shaped groove 2111 closer to the object side 213 is an object-side annular L-shaped groove, and the annular L-shaped groove 2111 closer to the image side 214 is Image side annular L-shaped groove. The two annular L-shaped grooves 2111 do not overlap each other in a direction parallel to the central axis A of the annular optical element. Each of the annular L-shaped grooves 2111 includes a first side 2111a and a second side 2111b interposed between the object side surface 213 and the image side surface 214 and connected to each other, and the strip structure 22 is disposed on the second side 2111b. One end of each strip structure 22 directly contacts the first side 2111a of the annular L-shaped groove 2111, and the other end thereof faces the image-side direction of the annular optical element. The shape and arrangement of the strip-like structures 22 are similar to those of the first embodiment, and will not be repeated here.

The bottom diameter φ2 of the image-side annular L-shaped groove (annular L-shaped groove 2111 near the image side 214) is larger than the bottom diameter φ1 of the object-side annular L-shaped groove (annular L-shaped groove 2111 near the object side 213). The inclination β between the first side 2111a and the central axis A of the annular optical element is greater than the inclination α between the second side 2111b and the central axis A of the annular optical element.

The condition parameters in the second embodiment are shown in the following table, and their definitions are the same as those in the first embodiment, and will not be repeated here.

<TABLE border = "1" borderColor = "# 000000" width = "85%"> <TBODY> <tr> <td> Second embodiment </ td> </ tr> <tr> <td> θ [degrees ] </ td> <td> 93.071 </ td> <td> L1 / L2 </ td> <td> 1.22 and 0.47 </ td> </ tr> <tr> <td> d1 / t </ td> <td> 0.21 </ td> <td> α [degree] </ td> <td> 3.025 </ td> </ tr> <tr> <td> d2 / t </ td> <td> 0.29 </ td> <td> h [mm] </ td> <td> 0.04 </ td> </ tr> <tr> <td> d1 / d2 </ td> <td> 0.73 </ td> <td> (φ2-φ1) / (φo-φi) </ td> <td> 0.26 </ td> </ tr> </ TBODY> </ TABLE>

<Third Embodiment>

Please refer to FIG. 10 to FIG. 12 at the same time, wherein FIG. 10 is a schematic side sectional view of a ring optical element according to a third embodiment of the present invention. 11 and 12 are partial enlarged views of the annular optical element of FIG. 10. In this embodiment, the ring-shaped optical element includes a ring-shaped body 31 and a plurality of strip-shaped structures 32 that are integrally formed.

The ring body 31 includes an inner ring surface 311, an outer diameter surface 312, an object side surface 313, and an image side surface 314. The inner annular surface 311 surrounds the central axis A of the annular optical element to form a central opening 315. The outer diameter surface 312 is opposite to the inner annular surface 311. The object side surface 313 faces the object side direction of the ring-shaped optical element and connects the outer diameter surface 312 and the inner ring surface 311. The image side surface 314 faces the image side direction of the ring-shaped optical element and connects the outer diameter surface 312 and the inner ring surface 311, and the image side surface 314 and the object side surface 313 are oppositely disposed. As shown in FIG. 10, the inner annular surface 311 of the annular optical element is jagged when viewed from the side of the annular optical element.

The inner annular surface 311 is provided with only a single annular L-shaped groove 3111. The annular L-shaped groove 3111 is provided with a strip structure 32, and a plurality of strip structures 32 on the annular L-shaped groove 3111 are arranged in a ring shape along the circumferential direction of the annular optical element. In detail, the annular L-shaped groove 3111 includes a first side 3111a and a second side 3111b interposed between the object side surface 313 and the image side surface 314 and connected to each other, and the strip structure 32 is disposed on the second side 3111b. The shape and arrangement of the strip-shaped structures 32 are similar to those of the first embodiment, and will not be repeated here. The inclination β between the first side 3111a and the central axis A of the annular optical element is greater than the inclination α between the second side 3111b and the central axis A of the annular optical element.

The angle between the first side 3111a and the second side 3111b of the annular L-shaped groove 3111 is θ, which satisfies the following conditions: θ = 93.071 degrees.

The thickness of the ring-shaped optical element is t, and the length of the strip structure 32 disposed in the ring-shaped L-shaped groove 3111 is d, which satisfies the following conditions: d / t = 0.56.

The width of the first side 3111a of the circular L-shaped groove 3111 is L1, and the width of the second side 3111b of the circular L-shaped groove 3111 is L2, which satisfies the following conditions: L1 / L2 = 0.71.

The inclination between the second side 3111b of the annular L-shaped groove 3111 and the central axis A of the annular optical element is α, which satisfies the following conditions: α = 3.306 degrees.

These strip structures 32 have a uniform height. The height of the strip structure 32 is h, which satisfies the following conditions: h = 0.04 mm.

The diameter of the bottom of the annular L-shaped groove 3111 is φg, the diameter of the outer diameter surface 312 of the annular optical element is φo, and the diameter of the inner annular surface 311 of the annular optical element is φi, which meets the following conditions: (φo-φg) / ( φg-φi) = 1.07.

<Fourth embodiment>

Please refer to FIG. 13 to FIG. 15 at the same time, wherein FIG. 13 is a schematic side sectional view of the annular optical element according to the fourth embodiment of the present invention, and FIG. 14 and FIG. 15 are partial enlarged views of the annular optical element of FIG. 13. In this embodiment, the ring-shaped optical element includes a ring-shaped body 41 integrally formed, a plurality of strip-shaped structures 42 and an axial assembly structure 43. The annular optical element is disposed in an optical lens group (not shown) through an axial assembly structure 43.

The ring body 41 includes an inner ring surface 411, an outer diameter surface 412, an object side surface 413, and an image side surface 414. The inner annular surface 411 surrounds the central axis A of the annular optical element to form a central opening 415. The outer diameter surface 412 is disposed opposite the inner annular surface 411. The object side surface 413 faces the object side direction of the ring-shaped optical element and connects the outer diameter surface 412 and the inner ring surface 411. The image side surface 414 faces the image side direction of the ring-shaped optical element and connects the outer diameter surface 412 and the inner ring surface 411, and the image side surface 414 and the object side surface 413 are oppositely disposed. As shown in FIG. 13, the inner annular surface 411 of the annular optical element is jagged when viewed from the side of the annular optical element.

The inner annular surface 411 is provided with three annular L-shaped grooves 4111, among which the annular L-shaped groove 4111 closest to the object side surface 413 is an object-side annular L-shaped groove, and the annular L-shaped groove 4111 closest to the image side 414 is an image The side annular L-shaped groove, and the annular L-shaped groove 4111 between the object-side annular L-shaped groove and the image-side annular L-shaped groove is a central annular L-shaped groove. The annular L-shaped grooves 4111 do not overlap each other in a direction parallel to the central axis A of the annular optical element. Each of the annular L-shaped grooves 4111 includes a first side 4111a and a second side 4111b which are interposed between the object side surface 413 and the image side surface 414 and are connected to each other. One end of each of the strip structures 42 directly contacts the first side 4111a of the annular L-shaped groove 4111, and the other end faces the image-side direction of the annular optical element. The shape and arrangement of the strip-like structures 42 are similar to those of the first embodiment, and will not be repeated here.

The bottom diameter φ2 of the image-side annular L-shaped groove (annular L-shaped groove 4111 closest to the image side 414) is larger than the bottom diameter of the object-side annular L-shaped groove (annular L-shaped groove 4111 closest to the object side 413). φ1. The inclination β between the first side 4111a and the central axis A of the annular optical element is greater than the inclination α between the second side 4111b and the central axis A of the annular optical element.

The angle between the first side 4111a and the second side 4111b of each annular L-shaped groove 4111 is θ, which satisfies the following conditions: θ = 108 degrees.

The thickness of the ring-shaped optical element is t, and the length of the strip structure 42 disposed on the object-side ring-shaped L-shaped groove is d1, which satisfies the following condition: d1 / t = 0.28.

The thickness of the ring-shaped optical element is t, and the length of the strip structure 42 disposed on the image-side ring-shaped L-shaped groove is d2, which satisfies the following condition: d2 / t = 0.56.

The thickness of the ring-shaped optical element is t, and the length of the strip structure 42 disposed in the central annular L-shaped groove is d3, which satisfies the following conditions: d3 / t = 0.28.

The length of the strip structure 42 provided on the object-side annular L-shaped groove is d1, and the length of the strip structure 42 provided on the image-side annular L-shaped groove is d2, which satisfies the following conditions: d1 / d2 = 0.50.

The width of the first side 4111a of the object-side annular L-shaped groove is L1, and the width of the second side 4111b of the object-side annular L-shaped groove is L2, which satisfies the following conditions: L1 / L2 = 1.60.

The width of the first side 4111a of the image-side annular L-shaped groove is L1, and the width of the second side 4111b of the image-side annular L-shaped groove is L2, which satisfies the following conditions: L1 / L2 = 0.73.

The width of the first side 4111a of the central annular L-shaped groove is L1, and the width of the second side 4111b of the central annular L-shaped groove is L2, which satisfies the following conditions: L1 / L2 = 2.20.

The inclination between the second side 4111b of the annular L-shaped groove 4111 and the central axis A of the annular optical element is α, which satisfies the following conditions: α = 17.955 degrees.

These strip structures 42 have a uniform height. The height of the strip structure 42 is h, which satisfies the following conditions: h = 0.04 mm.

The diameter of the bottom of the annular L-shaped groove on the object side is φ1, the diameter of the bottom of the annular L-shaped groove on the image side is φ2, the diameter of the outer diameter surface 412 of the annular optical element is φo, and the diameter of the inner annular surface 411 of the annular optical element is φi, which satisfies the following conditions: (φ2-φ1) / (φo-φi) = 0.35.

<Fifth Embodiment>

FIG. 16 is a partial enlarged view of a ring optical element according to a fifth embodiment of the present invention. In this embodiment, each of the strip structures 52 of the ring-shaped optical element includes a tapered portion 521. Compared to the top edge of the tapered portion in the first embodiment, which is a wedge-shaped top edge, the top portion 5212 of the tapered portion 521 in this embodiment is a curved surface.

<Sixth Embodiment>

FIG. 17 is a partial enlarged view of a ring optical element according to a sixth embodiment of the present invention. In this embodiment, each of the strip structures 62 of the ring-shaped optical element includes a tapered portion 621. The top 6212 of the tapered portion 621 in this embodiment is a rectangular plane.

<Seventh Embodiment>

FIG. 18 is a partial enlarged view of a ring optical element according to a seventh embodiment of the present invention. In this embodiment, each of the strip structures 72 of the ring-shaped optical element includes a tapered portion 721. Compared with the two inclined surfaces of the tapered portion between the bottom and the top in the first embodiment, the two inclined surfaces 7213 of the tapered portion 721 in this embodiment are jagged surfaces.

These strip structures 72 have a uniform height. The height of the strip structure 72 is h, which satisfies the following conditions: h = 0.08 mm.

<Eighth Embodiment>

FIG. 19 is a partial enlarged view of a ring-shaped optical element according to an eighth embodiment of the present invention. In this embodiment, each of the strip structures 82 of the ring-shaped optical element includes a tapered portion 821. The top 8212 of the tapered portion 821 in this embodiment is a rectangular plane.

These strip structures 82 have a uniform height. The height of the strip structure 82 is h, which satisfies the following conditions: h = 0.08 mm.

<Ninth Embodiment>

FIG. 20 is a schematic diagram of an imaging lens module according to a ninth embodiment of the present invention. In this embodiment, the imaging lens module 9 includes a ring-shaped optical element 90 and an optical lens group 91.

The ring-shaped optical element 90 is, for example, the ring-shaped optical element disclosed in the first embodiment. The optical lens group 91 includes a lens barrel 911, a plurality of lenses 912, and an electronic photosensitive element 913. The ring-shaped optical element 90 and the lens 912 are disposed in the lens barrel 911. Ring optic 90 is fixed The object side 113 of the ring is in contact with one of the lenses 912 of the optical lens group 91 and is used to fix the distance between the lenses 912. A central opening 115 of the ring-shaped optical element 90 is used to pass imaging light through the imaging lens module 9.

<Tenth Embodiment>

FIG. 21 is a schematic diagram of an imaging lens module according to a tenth embodiment of the present invention. In this embodiment, the imaging lens module 10 includes a ring optical element 100 and an optical lens group 101. The annular optical element 100 is, for example, the annular optical element disclosed in the fourth embodiment. The optical lens group 101 includes a lens barrel 1011, a plurality of lenses 1012, and an electronic photosensitive element 1013. The ring-shaped optical element 100 and the lens 1012 are disposed in the lens barrel 1011.

The ring-shaped optical element 100 includes an axial assembly structure 43. The annular optical element 100 is disposed on one of the lenses 1012 of the optical lens group 101 through the axial assembly structure 43. In addition, the axial assembly structure 43 is also used to align the annular optical element 100 and the lens 1012 adjacent to the annular optical element 100 with each other.

<Eleventh Embodiment>

22 is a schematic perspective view of an image capturing device according to an eleventh embodiment of the present invention. In this embodiment, the image capturing device 14 is a camera module. The image capturing device 14 includes an imaging lens module 10, a driving device 15, and an image stabilization module 16 of the tenth embodiment. The imaging lens module 10 further includes a support device (Holder Member, not otherwise labeled). The image capturing device 14 uses the optical lens group of the imaging lens module 10 to collect light to generate an image, and cooperates with the driving device 15 to focus the image. Finally, the electronic photosensitive element 1013 formed on the imaging lens module 10 is output as image data. The electronic photosensitive element 1013 (such as CMOS, CCD) of the imaging lens module 10 has high sensitivity, good noise, and low noise, which can truly present the good imaging quality of the imaging optical lens 10.

The driving device 15 may have an Auto-Focus function, and its driving method may use, for example, Voice Coil Motor (VCM), Micro Electro-Mechanical Systems (MEMS), and Piezoelectric And drive systems such as Shape Memory Alloy. Drive unit 15 allows imaging lens module 10 Obtain a better imaging position, which can provide a clear image of the subject at different object distances.

The image stabilization module 16 is, for example, an accelerometer, a gyroscope, or a Hall Effect Sensor. The driving device 15 can be used with the image stabilization module 16 as an optical image stabilization device (OIS). By adjusting the changes in the different axial directions of the imaging lens module 10 to compensate for the blur caused by shaking at the moment of shooting The image, or the image compensation technology in the imaging software, is used to provide Electronic Image Stabilization (EIS), which further improves the imaging quality of dynamic and low-light scenes.

The image pickup device of the present invention is not limited to the above structure. FIG. 23 is a schematic diagram of another image capturing device according to the present invention. The image capturing device 14 further includes a flash module 17. The flash module 17 can supplement light during shooting to improve imaging quality.

FIG. 24 is a schematic diagram of another image capturing device according to the present invention. The image capturing device 14 further includes a focus assist module 18. The focus assist module 18 can provide the object distance information of the subject to facilitate fast focusing. The focus assist module 18 can use infrared or laser focus assist systems to achieve fast focusing.

<Twelfth Embodiment>

Please refer to FIG. 25 and FIG. 26, wherein FIG. 25 is a schematic perspective view of one side of an electronic device according to a twelfth embodiment of the present invention. FIG. 26 is a schematic perspective view of the other side of the electronic device in FIG. 25. In this embodiment, the electronic device 20 is a smart phone. The electronic device 20 includes an image capturing device 14, an image signal processor 20a (Image Signal Processor), a user interface 20b, and an image software processor (not shown). In this embodiment, the image capturing device 14 includes an imaging lens module, a driving device, an image stabilization module, a flash module, and a focus assist module. The number of imaging devices is not intended to limit the present invention.

When the user shoots the subject, the electronic device 20 uses the image capturing device 14 to focus and capture images, and the image signal processor 20a performs image optimization processing to further improve the image quality generated by the imaging optical lens. The user interface 20b may adopt a touch screen or a physical shooting button, and cooperate with various functions of the image software processor to perform image shooting and image processing. The image processed by the image software processor can be displayed on the user interface 20b.

The electronic device 20 of the present invention is not limited to a smart phone. For example, the image capturing device 14 can also be applied to electronic devices such as tablet computers (as shown in FIG. 27) and wearable devices (as shown in FIG. 28) in various aspects. The annular optical element and the imaging lens module of the present invention are more applicable to three-dimensional (3D) image capture, digital cameras, mobile devices, digital tablets, smart TVs, network monitoring equipment, driving recorders, back-up developing devices, Multi-lens devices, recognition systems, somatosensory gaming machines, and wearable devices. The previously-disclosed electronic device is merely an example to illustrate the practical application of the present invention, and does not limit the application range of the image capturing device of the present invention.

Although the present invention is disclosed as above with the foregoing embodiments, these embodiments are not intended to limit the present invention. Changes and modifications made without departing from the spirit and scope of the present invention belong to the patent protection scope of the present invention. For the protection scope defined by the present invention, please refer to the attached patent application scope.

11, 21, 31, 41‧‧‧Ring body

111, 211, 311, 411‧‧‧ inner torus

1111, 2111, 3111, 4111‧‧‧ circular L-shaped groove

1111a, 2111a, 3111a, 4111a‧‧‧ First side

1111b, 2111b, 3111b, 4111b‧‧‧ Second side

112, 212, 312, 412‧‧‧

113, 213, 313, 413 ...

114, 214, 314, 414‧‧‧ like side

115, 215, 315, 415‧‧‧ center opening

12, 22, 32, 42, 52, 62, 72, 82‧‧‧ strips

121, 521, 621, 721, 821‧‧‧Tapered

1211, 7211‧‧‧ bottom

1212, 5212, 6212, 7212, 8212‧‧‧ Top

1213, 7213‧‧‧‧Slope

43‧‧‧ axial assembly structure

A‧‧‧center axis

9, 10‧‧‧ imaging lens module

90, 100‧‧‧ ring optics

91, 101‧‧‧ Optical lens group

911, 1011‧‧‧ lens barrel

912, 1012‧‧‧ lens

913, 1013‧‧‧Electronic photosensitive element

14‧‧‧Image taking device

15‧‧‧Drive

16‧‧‧Image stabilization module

17‧‧‧Flash Module

18‧‧‧ Focus Assist Module

20‧‧‧Electronic device

20a‧‧‧Image Signal Processor

20b‧‧‧user interface

α‧‧‧ The inclination between the second side and the central axis of the annular optical element

β‧‧‧ Tilt between the first side and the central axis of the ring optic

θ‧‧‧ Angle between the first side and the second side of the annular L-shaped groove

t‧‧‧thickness of ring optics

d‧‧‧ length of the strip-shaped structure provided in the circular L-shaped groove

d1‧‧‧ the length of the strip-shaped structure provided on the object side annular L-shaped groove

d2‧‧‧ the length of the strip-shaped structure provided in the annular L-shaped groove on the image side

d3‧‧‧ Length of the strip-shaped structure provided in the central annular L-shaped groove

L1‧‧‧Width of the first side of the circular L-shaped groove

L2‧‧‧Width of the second side of the circular L-shaped groove

h‧‧‧ height of strip structure

φ1‧‧‧Bottom diameter of object-side annular L-shaped groove

φ2‧‧‧ the bottom diameter of the annular L-shaped groove on the image side

φg‧‧‧Bottom diameter of annular L-shaped groove

φo‧‧‧ the diameter of the outer diameter surface of the annular optical element

φi‧‧‧ the diameter of the inner torus of the ring optic

FIG. 1 is a schematic perspective view of a ring optical element according to a first embodiment of the present invention. FIG. 2 is a schematic top view of the annular optical element of FIG. 1. FIG. 3 is a schematic side sectional view of the annular optical element of FIG. 1. 4 and 5 are partial enlarged views of the annular optical element of FIG. 3. FIG. 6 is a partially enlarged view of the annular optical element of FIG. 1. FIG. 7 is a schematic side sectional view of a ring-shaped optical element according to a second embodiment of the present invention. 8 and 9 are partial enlarged views of the annular optical element of FIG. 7. FIG. 10 is a schematic side sectional view of a ring-shaped optical element according to a third embodiment of the present invention. 11 and 12 are partial enlarged views of the annular optical element of FIG. 10. FIG. 13 is a schematic side sectional view of a ring-shaped optical element according to a fourth embodiment of the present invention. 14 and 15 are partial enlarged views of the annular optical element of FIG. 13. FIG. 16 is a partial enlarged view of a ring optical element according to a fifth embodiment of the present invention. FIG. 17 is a partial enlarged view of a ring optical element according to a sixth embodiment of the present invention. FIG. 18 is a partial enlarged view of a ring optical element according to a seventh embodiment of the present invention. FIG. 19 is a partial enlarged view of a ring-shaped optical element according to an eighth embodiment of the present invention. FIG. 20 is a schematic diagram of an imaging lens module according to a ninth embodiment of the present invention. FIG. 21 is a schematic diagram of an imaging lens module according to a tenth embodiment of the present invention. 22 is a schematic perspective view of an image capturing device according to an eleventh embodiment of the present invention. FIG. 23 is a schematic diagram of another image capturing device according to the present invention. FIG. 24 is a schematic diagram of still another image capturing device according to the present invention. 25 is a schematic perspective view of one side of an electronic device according to a twelfth embodiment of the present invention. FIG. 26 is a schematic perspective view of the other side of the electronic device in FIG. 25. FIG. 27 is a schematic diagram of another electronic device according to the present invention. FIG. 28 is a schematic diagram of still another electronic device according to the present invention.

Claims (28)

An annular optical element includes: an inner annular surface that surrounds a central axis of the annular optical element to form a central opening; an outer diameter surface opposite to the inner annular surface; and an object side facing the annular optical element An object-side direction connecting the outer diameter surface and the inner ring surface; and an image side facing the image-side direction of the annular optical element and connecting the outer diameter surface and the inner ring surface, the image side facing the object side Setting; wherein, the inner annular surface is provided with a plurality of annular L-shaped grooves, the annular L-shaped grooves are respectively provided with a plurality of strip-shaped structures, and the strip-shaped structures are ringed along the circumferential direction of the annular optical element The annular L-shaped grooves include an object-side annular L-shaped groove closest to the object side and an image-side annular L-shaped groove closest to the image side, and the image-side annular L-shaped groove The diameter of the bottom of the groove is larger than the diameter of the bottom of the annular L-shaped groove on the object side, wherein the annular L-shaped grooves respectively include a first side and a The second side, the strip structures are disposed on the first side and the second side One side, and the inclination of the first side of the central axis of the annular optical element is greater than the inclination of the second side of the central axis of the annular optical element. The ring-shaped optical element according to item 1 of the patent application scope, wherein the ring-shaped optical element includes a ring-shaped body and the strip structures, and the ring-shaped body includes the inner ring surface, the outer diameter surface, the object side surface, and the image. Side, and the strip-shaped structures are integrally formed with the ring body. The annular optical element according to item 2 of the scope of patent application, wherein the angle between the first side and the second side of each of the annular L-shaped grooves is θ, which satisfies the following conditions: 46 degrees <θ <136 degrees . The annular optical element according to item 3 of the scope of patent application, wherein the annular L-shaped grooves do not overlap each other in a direction parallel to the central axis. The annular optical element according to item 3 of the scope of patent application, wherein the angle between the first side and the second side of each of the annular L-shaped grooves is θ, which satisfies the following conditions: 64 degrees <θ <116 degrees . The ring-shaped optical element according to item 5 of the patent application scope, wherein the thickness of the ring-shaped optical element is t, and the length of each of the strip structures is d, which satisfies the following conditions: 0.05 <d / t <0.50. The annular optical element according to item 5 of the scope of patent application, wherein the number of the annular L-shaped grooves is two, and the two annular L-shaped grooves are the object-side annular L-shaped groove and the image-side ring, respectively. The length of each of the strip structures provided on the object-side annular L-shaped groove is d1, and the length of each of the strip structures provided on the image-side annular L-shaped groove is d2 , Which satisfies the following conditions: 0.40 <d1 / d2 <2.5. The annular optical element according to item 2 of the scope of patent application, wherein the width of the first side of each of the annular L-shaped grooves is L1, and the width of the second side of each of the annular L-shaped grooves is L2. , Which satisfies the following conditions: 0.45 <L1 / L2 <2.5. The annular optical element according to item 2 of the scope of patent application, wherein the inclination between the second side and the central axis of the annular optical element is α, which satisfies the following conditions: 0 degrees ≦ α ≦ 15 degrees. The annular optical element according to item 2 of the scope of patent application, wherein each of the strip structures is a wedge-shaped strip structure. The annular optical element according to item 10 of the application, wherein the wedge-shaped strip structure includes a tapered portion. The annular optical element according to item 11 of the application, wherein the tapered portion has a smooth surface. The annular optical element according to item 2 of the scope of the patent application, wherein the strip structures have a uniform height, and the height of each of the strip structures is h, which satisfies the following conditions: 0.015 mm <h <0.23 mm. The ring-shaped optical element according to item 2 of the patent application scope, wherein the inner ring surface is zigzag when the ring-shaped optical element is viewed from the side. The annular optical element according to item 1 of the patent application scope, wherein the bottom diameter of the object-side annular L-shaped groove is φ1, the bottom diameter of the image-side annular L-shaped groove is φ2, The diameter of the diameter surface is φo, and the diameter of the inner annular surface of the annular optical element is φi, which satisfies the following conditions: 0.05 <(φ2-φ1) / (φo-φi) <0.55. An imaging lens module includes: a ring-shaped optical element as described in item 1 of the scope of patent application; and an optical lens group, and the ring-shaped optical element is disposed in the optical lens group. The imaging lens module according to item 16 of the scope of patent application, wherein the annular optical element further includes an axial assembly structure, the annular optical element is disposed on the optical lens group through the axial assembly structure, and the axial direction The assembling structure is used for aligning the ring-shaped optical element with the lens adjacent to the ring-shaped optical element in the optical lens group. The imaging lens module according to item 16 of the patent application scope, wherein the annular optical element is a fixing ring, the fixing ring is used for fixing the distance between the plurality of lenses of the optical lens group, and the center of the annular optical element is opened. The hole is used to pass imaging light through the imaging lens module, and only one of the object side and the image side of the annular optical element is in contact with the optical lens group. An electronic device includes the imaging lens module according to item 16 of the scope of patent application. An annular optical element includes: an inner annular surface that surrounds a central axis of the annular optical element to form a central opening; an outer diameter surface opposite to the inner annular surface; and an object side facing the annular optical element An object-side direction connecting the outer diameter surface and the inner ring surface; and an image side facing the image-side direction of the annular optical element and connecting the outer diameter surface and the inner ring surface, the image side facing the object side Provided; wherein the inner torus is provided with at least one annular L-shaped groove, the at least one annular L-shaped groove is provided with a plurality of wedge-shaped strip structures, and the wedge-shaped strip structures are arranged along the annular optical element. Circumferentially arranged in the circumferential direction, and the wedge-shaped strip structures each include a tapered portion; wherein, the at least one annular L-shaped groove includes a first interposed between the object side and the image side and connected to each other. Side and a second side, the inclination of the first side and the central axis of the annular optical element is greater than the inclination of the second side and the central axis of the annular optical element, and the wedge-shaped strip structures are disposed on The second side; wherein the second side and the The inclination of the central axis of the circular optical element is α, the bottom diameter of the at least one annular L-shaped groove is φg, the diameter of the outer diameter surface of the annular optical element is φo, and the inner annular surface of the annular optical element The diameter of is φi, which satisfies the following conditions, which satisfies the following conditions: 0 ° ≦ α ≦ 15 °; and 0.5 <(φo-φg) / (φg-φi) <10. The annular optical element according to item 20 of the scope of patent application, wherein an angle between the first side and the second side of the at least one annular L-shaped groove is θ, which satisfies the following conditions: 46 degrees <θ <136 degrees . The ring-shaped optical element according to item 20 of the patent application scope, wherein the thickness of the at least one ring-shaped optical element is t, and the length of each of the wedge-shaped strip structures is d, which satisfies the following conditions: 0.05 <d / t < 0.50. The annular optical element according to item 20 of the application, wherein the width of the first side of the at least one annular L-shaped groove is L1, and the width of the second side of the at least one annular L-shaped groove is L2. , Which meets the following conditions: 0.45 <L1 / L2 <2.0. The annular optical element according to item 20 of the application, wherein the inclination between the second side and the central axis of the annular optical element is α, which satisfies the following conditions: 0 ° ≦ α ≦ 8.0 °. The annular optical element according to item 20 of the application, wherein the wedge-shaped strip structures have a uniform height, and each of the tapered portions of the wedge-shaped strip structures has a smooth surface. An imaging lens module includes: a ring-shaped optical element according to item 20 of the patent application scope; and an optical lens group, and the ring-shaped optical element is disposed in the optical lens group. The imaging lens module according to item 26 of the patent application scope, wherein the annular optical element further includes an axial assembly structure, the annular optical element is disposed on the optical lens group by the axial assembly structure, and the axial direction The assembling structure is used for aligning the ring-shaped optical element with the lens adjacent to the ring-shaped optical element in the optical lens group. The imaging lens module according to item 26 of the patent application scope, wherein the annular optical element is a fixing ring, the fixing ring is used for fixing the distance between the plurality of lenses of the optical lens group, and the center of the annular optical element is opened. The hole is used to pass imaging light through the imaging lens module, and only one of the object side and the image side of the annular optical element is in contact with the optical lens group.